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Flashcards in Embryology Deck (21):
1

Epithelium of mucosa and associated ducts and glands are derived from the ___derm

endoderm

2

The part of the GI tract derived from mesoderm

most of it - BAR epithelium
lamina propria, muscularis mucosa+externa
submucosal and serosa connective tissue

3

ventral mesentery develops to form:

falciform ligament and lesser omentum

4

dorsal mesogastrium develops to form:

greater omentum

5

4 embryological mesenteries =

ventral mesentery
dorsal mesogastrium, dorsal mesoduodenum and dorsal mesocolon

6

Oesophagus is distinguishable at __
Circular muscle develops at ___
Longitudinal at __

4wks
5wks
8wks

7

The stomach starts as a ______ at wk _
90 degree AP rotation at ___
90 degree longiudinal rotation at __

dilatation of the caudal part of foregut wk4
35 days
56 days

8

At 10 wks liver is large because

has a large haemopoeitic role

9

Hepatic diverticulum is derived from __derm
it grows into the ___

endoderm
septum transversum mesoderm

10

hepatocytes and biliary tree lining are derived from ___derm

endoderm

11

haemopoeitic liver cells, Kupffer cells and connective tissue of liver and gallbladder are from ___derm

mesoderm

12

Pancreas comes from the fusion of __+__buds

dorsal and ventral pancreatic

13

annular pancreas =

ventral bud is bilobed and wraps around duodenum causing duodenal stenosis

14

Spleen is derived from __derm at wk _
Is haemopoeitic until ___ then becomes __
In foetus it is ___ , these recede before birth

mesoderm 5th wk
wk 15-18 lymphatic
lobular

15

Midgut - for most of its development it communicates with __ this communication narrows until it is only held by ___

yolk sac
vitelline duct

16

Midgut herniates ventrally from embryo at wk__
reenters at wk __

5
10

17

On day 50 midgut rotates 90degrees around ___
___ is on the left (with caecal bud) and ___ on the right

superior mesenteric artery
caudal on L
cranial on R

18

Developmental defects of midgut= (6)

vitelline fistula, vitelline cyst, vitelline ligament (due to bad re-entry
omphalocele
meckel's diverticulum
non-rotation

19

Omphalocele =

abdominal hernia into umbilical cord

20

Cloaca becomes the _+_
an expansion of __derm

hiindgut and urogenital system
endoderm

21

Lumen of cloaca is occluded at __ as ___proliferates
___form and it is recanalised at wk _ with ___

wk5/6 mucosa
vacuoles
wk 9
villi